Wireless cameras offer an easier vector for people to get into your camera feeds. Biggest risk to this is a poorly secured network in the first place, but the risk is still there.

Also, wireless is going to be inherently a worse quality video stream, and constant video traffic being sent over your Wi-Fi bogs down your entire network.

All that being said Wi-Fi cameras are just fine and as long as you have strong Wi-Fi security you're really not at a real risk unless someone very savvy is specifically targeting you, in which case you've got bigger problems.

I have probably a dozen cheap wireless cameras in my house (to keep an eye on pets) and I have them spaced over two access points and honestly I don't notice a difference on my Wi-Fi at all, but I'm sure it's worse than if I didn't have them. All my exterior cameras are wired, but that's more because I want better quality streams and I'm running a wire anyways so might as well be PoE. Only exterior wireless camera I have is my doorbell but that's because I didn't want to run a new wire to it.

Overall wired cameras are much better quality, but they're not as convenient. Make the decision for yourself based off of your priorities. Real tough to get a wireless camera with the fidelity needed to capture license plates clearly, but if you don't need that then why worry about whether your gear can achieve it or not?